When to use IS feature on lens?

I was seeing that the IS feature is only good for still objects... basically it helps in case I shake the camera, etc. But, it won't help with moving objects such as wildlife, right? In this case do I have to turn it off? Or is the only case where I have to turn it off when I put my camera on a tripod? I'm just a bit confused...

It's not going to hurt anything for normal shots if you leave it on. People say to turn it off on a tripod but lots of IS lenses detect when they are on a tripod and turn themselves off. I've done comparisons for myself of on vs. off and they are most often identical.

Depends on the lens/version of IS. With my EF300 f/4 IS(old IS), i have to turn it off on the tripod.. it just blurs the pic on some of the shots. With the newer implementations, i leave it on. As for regular shots, i leave it on all the time.. doesn't seem to hurt.

Depends on the model of course. Some lenses with IS engaged will still focus faster than other specific models without it. I'd say it depends whether the deviation in focus time is worth it. My 70200II is fast enough in focusing with IS engaged. Even with a fair amount of light in the daytime for birding, I still keep it on anytime I'm handholding. Higher keeper rate. On the tripod, it's off--very, very annoying.

I don't get this whole 'get rid of the IS while shooting anything fast' issue, I think it's wonderful to have IS to nail the framing of the shot! And let's not forget about panning shots, IS is certainly a useful tool when doing that!

I wouldn't say it's pretty common knowledge that it slows focus speed - I doubt it has any major effect on focus aside from the millisecond that it takes for the IS to activate.

Katalyst wrote in post #12451266I don't get this whole 'get rid of the IS while shooting anything fast' issue,

I would suggest that's because you obviously don't understand how IS works, or what its primary object is.The reason it's suggested that IS is turned off when shooting fast moving or erratically moving objects (race cars, football players etc) or objects is because it's not designed to, and is incapable of stopping movement in the subject.It is designed to eliminate camera shake caused by the user.Using higher shutter speeds for sports essentially negates the need for IS.

Katalyst wrote in post #12451266...I think it's wonderful to have IS to nail the framing of the shot!...

and just how does IS help to "nail the framing of the shot"?IS can't possibly control how the photo is composed.

Katalyst wrote in post #12451266...And let's not forget about panning shots, IS is certainly a useful tool when doing that!...

Not necessarily.Good panning technique is going to help far more than IS.Later lenses with the two modes of IS may assist when in Mode 2, but almost all the photographers I regularly shoot with IS lense with actually have IS off, and some, myself included (with the 100-400L), actually have them taped so that the switch doesn't get turned on.My 300/2.8 and 70-200/2.8 are both non IS models. Deliberately purchased because I don't use IS and didn't see the need to pay for a feature I don't use.I shoot a fair bit of motorsport and don't seem to do too badly with no IS and frequently pan at shutterspeeds as slow as 1/5sec.

The reason being is as I mentioned above - when using high shutter speeds, IS has no effect (or at best, little effect) because the (usually) faster shutter speeds effectively negate the need for image stabilisation - you are not likely to get camera shake.

I know how IS works just fine, and if I use it where other people don't... Does that make me use it the wrong way, or just different? Anyway, I've recently panned some motorsports and I was happy to have IS Mode 2 on it when the shutterspeed were between 1/30 and 1/50... In my opinion, there is no arguing that IS is helpful!

Sirrith wrote in post #12451465I find it does, because when IS is on the frame just stops moving around as much, especially with long lenses, which helps you control composition better.

Exactly, my dad does Triathlon's and IS helps me to get the framing just right by providing a more calm and stable peek through the viewfinder!

My 300/2.8 and 70-200/2.8 are both non IS models. Deliberately purchased because I don't use IS and didn't see the need to pay for a feature I don't use.I shoot a fair bit of motorsport and don't seem to do too badly with no IS and frequently pan at shutterspeeds as slow as 1/5sec.

i'm thinking about a 70-200 & i would go for the 2.8 over the 4/IS because of the subjects i'd shoot as you've said there ^^

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